Statistics: Evaluating if a theory is true

At one time, the theory of biorhythms was very popular. The theory behind it is that our lives are affected by three primary cycles: Physical, Emotional, and Intellectual. These three cycles can be plotted as sine waves, beginning at zero on the day that a person is born. When any of the individual cycles is at a high point, then the things that we do that require the use of that trait are more successful. When any of the individual cycles is at a low point, then the reverse is true. Some people routinely monitor their biorhythms and act accordingly. In fact, there was a Japanese bus company that would not let its drivers drive a bus on days when their biorhythms were critical.

How might we evaluate this theory, to test whether it is true?

Solution Preview

Once again, we can apply the theory of statistical hypothesis testing to check whether there is any evidence in the validity of this theory of biorhythms in reality. I would collect samples of data on the quality of work performed by several individuals during their high and low points. For example, if students ...

Solution Summary

At one time, the theory of biorhythms was very popular. The theory behind it is that our lives are affected by three primary cycles: Physical, Emotional, and Intellectual. These three cycles can be plotted as sine waves, beginning at zero on the day that a person is born. When any of the individual cycles is at a high point, then the things that we do that require the use of that trait are more successful. When any of the individual cycles is at a low point, then the reverse is true. Some people routinely monitor their biorhythms and act accordingly. In fact, there was a Japanese bus company that would not let its drivers drive a bus on days when their biorhythms were critical.